HBP/CBP - High/Commercial Back Pressure APPLICATION, R134a Refrigerant, 115V 1 Phase 60Hz, 1/3 HP, High Start Torque (HST) 4528 BTU Capacity, 3/8" FLARE (SAE) SUCTION LINE SIZE, 0.250" Sweat (1/4" ODF) DISCHARGE LINE SIZE, Induction Run (RSIR/CSIR), Standard Efficiency Reciprocating Compressor (Model:AE4440Y-AA1A)